Enoch (Ee-nock) is not like other workers of the underworld of Skyrim. He's dangerous, yes. But he's also completely two faced.He can put on a perfectly civil, polite, and generous persona during the day, but by night he's cold, business like and blood thirsty. He's the Guild Master of the Thieves Guild and is responsible for their rapid rise in Skyrim. He's one of the three Nightingales of Nocturnal, He's the Listener and savior of the Dark Brotherhood, Arch-Mage of Winterhold College, Thane of Whiterun, master mercenary, vampire lord...

And of course, Dragonborn.

Enoch also won't kill you for simple things like being rude to him or giving him the stink eye. (He may clear your house of "unused" thing though...)

Despite being this way, he does have loyalty to his guilds and groups respectively and sees each of them as family. Wrong them and you can expect a Blade of Woe through the belly.